I released a new version of Cache Images, 3.0. By popular users requests, it contains two new improvements: option to enable automatic caching, and option to also cache images that are only linked from posts.
Also it contains one more improvements: complete ajaxification. Now you can do all work on one page, without need for reloading.
Unfortunately, I didn’t find solution for one known issue but as soon as I find one, I release a new update.